A/F ratio problem

Reply Subscribe

Thread Tools

Search this Thread

11-23-2010, 09:18 PM

maddmojo15

New Member

Thread Starter

Join Date: 06-24-10

Location: joliet, illinois

Posts: 44

Likes: 0

Received 0 Likes on 0 Posts

A/F ratio problem

have a 2010 tc ss w/ gms1, hahn intake, dejon cp w/ hks bov. the weather is about 33-40 degrees where im at. recently noticed the car would jerk oddly once or twice after shifting into gears. check my a/f ratio guage and the needle is jumping from 12 to 16 and sometimes 18 after shifting into gear, espically 2-4 gear. the issue has been going on for about 5 days now and i want to get your input on what it maybe or how i can reslove it. thanks for any help & advice

Reply Like

11-23-2010, 09:23 PM

09BlueBaltSS

Senior Member

Join Date: 05-13-09

Location: Davie, Fl

Posts: 2,954

Likes: 0

Received 0 Likes on 0 Posts

12 a/f is really rich for gms1 and its normal to swing way lean during shifts

Reply Like

11-23-2010, 09:26 PM

blrt

Senior Member

Join Date: 09-16-09

Location: south west of GTA

Posts: 768

Likes: 4

Received 29 Likes on 23 Posts

Quote:

Originally Posted by maddmojo15

Maybe a fried front 02 sensor? Just a guess..

Reply Like

11-23-2010, 09:33 PM

Chevycobaltss3

Banned

iTrader: (2)

Join Date: 10-24-08

Location: Vine Grove Kentucky

Posts: 12,838

Likes: 0

Received 1 Like on 1 Post

Take alk ure aftermarjet off and put stockr **** back on if ure not tuned for it

Reply Like

11-23-2010, 09:35 PM

09BlueBaltSS

Senior Member

Join Date: 05-13-09

Location: Davie, Fl

Posts: 2,954

Likes: 0

Received 0 Likes on 0 Posts

Totally missed the bov. Yup that will do it

Reply Like

11-23-2010, 09:36 PM

maddmojo15

New Member

Thread Starter

Join Date: 06-24-10

Location: joliet, illinois

Posts: 44

Likes: 0

Received 0 Likes on 0 Posts

take all the aftermarket stuff off or just the bov?

Reply Like

11-23-2010, 09:37 PM

09BlueBaltSS

Senior Member

Join Date: 05-13-09

Location: Davie, Fl

Posts: 2,954

Likes: 0

Received 0 Likes on 0 Posts

bov. Get a block off plate. Do you still have the factory bpv or did you block that off?

Reply Like

11-23-2010, 09:38 PM

maddmojo15

New Member

Thread Starter

Join Date: 06-24-10

Location: joliet, illinois

Posts: 44

Likes: 0

Received 0 Likes on 0 Posts

ok so take the bov off until i can get a tune for the bov? is it ok to leave the bov discennected in place of the cp so i can at least keep the piping?

Reply Like

11-23-2010, 09:40 PM

maddmojo15

New Member

Thread Starter

Join Date: 06-24-10

Location: joliet, illinois

Posts: 44

Likes: 0

Received 0 Likes on 0 Posts

i didnt buy the block off plate... i went thru the dejon pipe thread install and just followed all the instructions & bypassed it i believe

Reply Like

11-23-2010, 09:45 PM

#10

ronn

Senior Member

iTrader: (3)

Join Date: 09-30-09

Location: Los Angeles

Posts: 2,532

Likes: 0

Received 0 Likes on 0 Posts

Quote:

Originally Posted by 09BlueBaltSS

Totally missed the bov. Yup that will do it

You would think it would run pig rich with BOV not tuned in. Metered air vanishes...so ECU thinks there's more air than there really is?

Last edited by ronn; 11-23-2010 at 10:14 PM.

Reply Like

11-23-2010, 09:49 PM

#11

09BlueBaltSS

Senior Member

Join Date: 05-13-09

Location: Davie, Fl

Posts: 2,954

Likes: 0

Received 0 Likes on 0 Posts

OP you should have an engine light on. Correct? How long have you had the bov on the car?

Reply Like

11-23-2010, 09:51 PM

#12

05Slowline

Banned

iTrader: (2)

Join Date: 06-03-10

Location: HBG/Hanover

Posts: 6,919

Likes: 0

Received 0 Likes on 0 Posts

maybe putting a bov on a recirc car???

Reply Like

11-23-2010, 09:55 PM

#13

maddmojo15

New Member

Thread Starter

Join Date: 06-24-10

Location: joliet, illinois

Posts: 44

Likes: 0

Received 0 Likes on 0 Posts

yes.. cel has beeen on for 4 days and the bov has been on for maybe a week & half... do u suggest just removing the vac line from the bov so its not opperable?

Reply Like

11-23-2010, 10:08 PM

#14

AndrewSS/TC

Senior Member

Join Date: 09-05-10

Location: St. Louis, MO

Posts: 1,668

Likes: 0

Received 0 Likes on 0 Posts

I'm stock and mine goes as low as 11

Reply Like

11-23-2010, 10:12 PM

#15

maddmojo15

New Member

Thread Starter

Join Date: 06-24-10

Location: joliet, illinois

Posts: 44

Likes: 0

Received 0 Likes on 0 Posts

its weird though... ill be cruising at 30 or 40 and the car will pull for a sec or two w/o me giving it any more gas

Reply Like

11-23-2010, 10:13 PM

#16

05Slowline

Banned

iTrader: (2)

Join Date: 06-03-10

Location: HBG/Hanover

Posts: 6,919

Likes: 0

Received 0 Likes on 0 Posts

bov blew the welds on the im

Reply Like

11-23-2010, 10:19 PM

#17

maddmojo15

New Member

Thread Starter

Join Date: 06-24-10

Location: joliet, illinois

Posts: 44

Likes: 0

Received 0 Likes on 0 Posts

for now should i just diconnect bov?

Reply Like

11-23-2010, 10:22 PM

#18

09BlueBaltSS

Senior Member

Join Date: 05-13-09

Location: Davie, Fl

Posts: 2,954

Likes: 0

Received 0 Likes on 0 Posts

Is the stock bypass valve still there and hooked up?

Reply Like

11-23-2010, 10:36 PM

#19

maddmojo15

New Member

Thread Starter

Join Date: 06-24-10

Location: joliet, illinois

Posts: 44

Likes: 0

Received 0 Likes on 0 Posts

the bpv is still there & hooked up

Reply Like

11-24-2010, 12:12 AM

#20

tomj77

Super Moderator

Platinum Member

iTrader: (2)

Join Date: 07-14-08

Location: canada

Posts: 12,015

Likes: 1

Received 154 Likes on 131 Posts

Quote:

Originally Posted by maddmojo15

take ur foot off the gas once, it will go up to 30. lol i dont think there is a problem, when u lift ur foot off the gas it will go lean. drive down the highway, giver a little and take ur foot all the way off the gas, it will go up to 30. its normal